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AssigneeNoranda Inc.
InventorsCarole Allen, Peter Kondos, Serge Payant, Gezinus Van Weert, Anthonie Van Sandwijk
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The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxygen; precipitating iron from the leach solution using magnesium oxide and oxygen; removing copper, silver, cadmium, cobalt and lead from the leach solution by cementation with zinc dust; precipitating zinc oxide from the leach solution using magnesium oxide; and spray roasting the remaining magnesium chloride leach solution to regenerate hydrochloric acid and magnesium oxide. The present invention further relates to processes for recovering copper, silver, lead, and iron from complex sulfide materials.
A process for recovering (i) zinc oxide, (ii) iron, and (iii) at least one of copper, silver, cadmium, cobalt and lead from a material that includes zinc, iron, and at least one of copper, silver, cadmium, cobalt and lead, comprising the steps of:
A process for producing zinc oxide from a material which contains (i) zinc, (ii) iron, and (iii) at least one of copper, silver, cadmium, cobalt and lead, the process comprising the steps of:
Dependencies are inferred from the claim text.